Datasheet LTC3861-1 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing |
| Pages / Page | 38 / 7 — Typical perFormance characTerisTics. 128-Cycle Overcurrent Counter. … |
| File Format / Size | PDF / 1.3 Mb |
| Document Language | English |
Typical perFormance characTerisTics. 128-Cycle Overcurrent Counter. (Single Phase Using FDMF6707B. Overcurrent Threshold
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LTC3861-1
Typical perFormance characTerisTics 128-Cycle Overcurrent Counter (Single Phase Using FDMF6707B Overcurrent Threshold DrMOS) Oscillator Frequency vs RFREQ vs Temperature
2.5 40 PWM ILIM = 1.2V 2V/DIV 2.3 35 TRACK/SS 2.1 200mV/DIV 1.9 30 VOUT 1.7 TAGE (mV) 500mV/DIV 1.5 25 1.3 1.1 20 IL 0.9 ILIM = 800mV 20A/DIV 15 0.7 0.5 CURRENT SENSE VOL 50µs/DIV 38611 G19 OSCILLATOR FREQUENCY (MHz) 10 V 0.3 IN = 12V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.8V 0.1 5 0 20 40 60 80 100 120 –50 0 50 100 150 RFREQ (kΩ) TEMPERATURE (°C) 38611 G20 38611 G21
600kHz Preset Frequency ILIM Pin Current vs Temperature FREQ Pin Current vs Temperature vs Temperature
20.6 20.6 620 20.4 20.4 615 20.2 20.2 610 20.0 605 20.0 19.8 600 19.8 PIN CURRENT (µA) 19.6 TOR FREQUENCY (kHz) 595 I LIM 19.6 FREQ PIN CURRENT (µA) 19.4 590 19.4 OSCILLA 19.2 585 19.2 19.0 580 –50 0 50 100 150 –50 0 50 100 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 38611 G22 38611 G23 38611 G24
400kHz Preset Frequency Shutdown Quiescent Current vs Temperature Quiescent Current vs Temperature vs Temperature
395 24 34 VIN = 6V VIN = 6V VCC = 5V VCC = 5V 390 22 RUN1 = RUN2 = 5V 33 20 385 32 18 380 31 16 375 30 14 QUIESCENT CURRENT (mA) SHUTDOWN CURRENT (µA) OSCILLATOR FREQUENCY (kHz) 370 12 29 365 10 28 –50 0 50 100 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 38611 G25 38611 G26 38611 G27 38611fb For more information www.linear.com/LTC3861-1 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Related Parts
Typical perFormance characTerisTics 128-Cycle Overcurrent Counter (Single Phase Using FDMF6707B Overcurrent Threshold DrMOS) Oscillator Frequency vs RFREQ vs Temperature
2.5 40 PWM ILIM = 1.2V 2V/DIV 2.3 35 TRACK/SS 2.1 200mV/DIV 1.9 30 VOUT 1.7 TAGE (mV) 500mV/DIV 1.5 25 1.3 1.1 20 IL 0.9 ILIM = 800mV 20A/DIV 15 0.7 0.5 CURRENT SENSE VOL 50µs/DIV 38611 G19 OSCILLATOR FREQUENCY (MHz) 10 V 0.3 IN = 12V fSW = 500kHz EXTERNAL CLOCK VOUT = 1.8V 0.1 5 0 20 40 60 80 100 120 –50 0 50 100 150 RFREQ (kΩ) TEMPERATURE (°C) 38611 G20 38611 G21
600kHz Preset Frequency ILIM Pin Current vs Temperature FREQ Pin Current vs Temperature vs Temperature
20.6 20.6 620 20.4 20.4 615 20.2 20.2 610 20.0 605 20.0 19.8 600 19.8 PIN CURRENT (µA) 19.6 TOR FREQUENCY (kHz) 595 I LIM 19.6 FREQ PIN CURRENT (µA) 19.4 590 19.4 OSCILLA 19.2 585 19.2 19.0 580 –50 0 50 100 150 –50 0 50 100 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 38611 G22 38611 G23 38611 G24
400kHz Preset Frequency Shutdown Quiescent Current vs Temperature Quiescent Current vs Temperature vs Temperature
395 24 34 VIN = 6V VIN = 6V VCC = 5V VCC = 5V 390 22 RUN1 = RUN2 = 5V 33 20 385 32 18 380 31 16 375 30 14 QUIESCENT CURRENT (mA) SHUTDOWN CURRENT (µA) OSCILLATOR FREQUENCY (kHz) 370 12 29 365 10 28 –50 0 50 100 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 38611 G25 38611 G26 38611 G27 38611fb For more information www.linear.com/LTC3861-1 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Related Parts
